The block casting you gave shows a 1980-1985 Corvette and the heads were used on 1979-1985 350 / 400 cu in motors . I will be able to tell you exactly what it came from when you post the engine stamping that is on the block . The heads should be 1.94 intake valve heads with 76 cc chambers . I do not know how they flow compared to 882's . Frank
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